Estrogen , or oestrogen , is a category of sex hormone responsible for the development and regulation of the female reproductive system and secondary sex characteristics. There are three major endogenous estrogens that have estrogenic hormonal activity: estrone E1 , estradiol E2 , and estriol E3. Estradiol, an estrane , is the most potent and prevalent. Another estrogen called estetrol E4 is produced only during pregnancy. Estrogens are synthesized in all vertebrates [1] and some insects. Quantitatively, estrogens circulate at lower levels than androgens in both men and women.
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In this lesson, we will look at some of the ways in which heredity helps to shape the way we are. We will look at what happens genetically during conception and take a brief look some genetic abnormalities. Before going into these topics, however, it is important to emphasize the interplay between heredity and the environment. Why are you the way you are?
Your comments (16)
marylinhot 13.02.2021
I want to fuck your ass!
HornyBoySex 15.02.2021
du bist echt wunderschГѓВ¶n kleine.
crazyfuck73 15.02.2021
Damn that's one hot ass I'd like to pound!
BDW93 15.02.2021
I LOVE HER!
slicktongue 17.02.2021
Pretty Phat. Just how I like it.
Jolly_RogerVF 17.02.2021
wow.great picture.
kylesun300 18.02.2021
you got to give me more baby
AntonyHard 18.02.2021
love the eye contact
caglar3475 19.02.2021
Love that ass! Fishnets are a nice touch too!
MarvinM 20.02.2021
You are having so much fun.
laurentdracip 20.02.2021
this pic is exxellent, wow, wats her name?
eatunow69 20.02.2021
dem damn lips! nice. real nice!
MaleMaleMan 20.02.2021
gotta love a woman who will take it to the face
kamikaze121 20.02.2021
Wow! Dir w\u00fcrde ich ja sowas von gern die L\u00f6cher stopfen, du geiles st\u00fcck. Wie w\u00e4r\u00b4s?
I want to fuck your ass!
du bist echt wunderschГѓВ¶n kleine.
Damn that's one hot ass I'd like to pound!
I LOVE HER!
Pretty Phat. Just how I like it.
wow.great picture.
you got to give me more baby
love the eye contact
Love that ass! Fishnets are a nice touch too!
You are having so much fun.
this pic is exxellent, wow, wats her name?
dem damn lips! nice. real nice!
gotta love a woman who will take it to the face
Wow! Dir w\u00fcrde ich ja sowas von gern die L\u00f6cher stopfen, du geiles st\u00fcck. Wie w\u00e4r\u00b4s?
Wowzerssss
Hoo yea masturbating! I like your pictures!